Improvement in quartz-mills



Iwl LLIAM C; STYLES.

Improvement in Quarz NHHS.

PatentedMarch12,1-72.

A'rnlv'r CrrICE.

IMPROVEMENT IN QUARTZ-MILLS.

Specification forming part of Letters Patent No. 124,637, dated March12, 1872.

SPECIFICATION.

To all whom it may concern:

Be it known that I, WILLIAM C. S'IILEs, oi' Nevada City, county ofNevada, State of California, have invented an Improvement inQuartz-Mills; and I do hereby declare the following description andaccompanying drawing are sufficient to enable any person skilled in theart or science to which it most nearly appertains to make and use mysaid invention Or improvements without further invention or eX-periment.

My invention relates to an improvement in quartzmills, such as areemployed for pulverizing gold and silver bearing rocks in order to fitthem for the purposes of amalgamation. 'It consists in the use of two ormore circular mortars having inclined iloors, and provided with scraperswhich revolve in a horizontal plane about the stamps so as to carry therock to the center and beneath the stamps. From these mortars thepulverized rock passes out through coarse circular screens to acylindrical screen, which revolves on a horizontal axis. The liner partof the pulp then passes through into hoppers beneath and from these iscarried to the amalgamators, while the coarser particles which will notpass through this screen, will be discharged at the end into a hopper,from l which they are conveyed to still a third mortar,

where it is so lpulverized as to pass through the surrounding finescreen.

Referring to the accompanying drawing for a more complete explanation ofmy invention, Figure l is a front elevation of battery showing thecylinder. Fig. 2 is a plan. Fig. 3 is an end view of the batteries and aside view of the cylinder.

A is the horizontal cam-shaft of a battery, carrying any suitable numberof cams, B. In the present case Onlyltwo stamps are shown, but it isobvious that any number can be employed and arranged in the same manner.C is a Stampstem. D is the stamp, and E is the tappet by which the camelevates the stamp. The mortar is made with an inclined bottom as at cc, and the shoe or die Fis placed in an opening in the center. Wheneverit is necessary to ren1ove`the shoe it can be done by inserting a wedgein the opening shown at G. A pulley, H, is keyed to the cam-shaft, andby means of a belt drives the gear I. This gear in turn moves the gear Jwhich is secured to the sleeve K, so that it turns freely about the stemC. Bent arms L are secured to the sleeve and carry at their lower endsthe scrapers M, which serve to move the contents of the mortar towardthe center so as to carry it all under the stamp. When sufficientlypulverized, the pulp is allowed to pass through a coarse circularscreen, N, which surrounds the niortar, and from thisit slides down thespout O, and is discharged into the horizontal cylindrical screen P,which is revolvedpartly under water so that the particles will becarried through the screen during its revolution and fall into thehoppers R. A sort of brush or scraper, Q, is arranged tO bear againstone side of the screen and remove any particles of sand or other matterthat may chance to become wedged in the meshes of the screen, and tendto choke it so as to prevent the pulp from passing through. From thesehoppers the iinely-ground pulp is carried through small tubes `or pipes,which connect with the bottom of the hoppers into a trough below, andfrom this it is conveyed directly into vats or other receptacle wherethe amalgamation is accomplished. The coarser particles not being ableto pass through the revolving-screens above mentioned, are carried outthrough the end of the screen, and fall into another hopper from whichthey are carried by small tubes, as before described, to a third batterywhere they are further reduced before being sent to the amalgamatingvats.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. The circular screenN in combination with the hearths o o, cylindricalrevolving screen I?, brush Q, and hoppers R, all arranged and applied toa quartz-mill, substantially as described.

2. Incombination with the mortar with its inclined iioor, as shown, Iclaim the revolving scrapers M, with their operating devices,substantially as and for the purpose described.

In witness that the above described invention is claimed by me I havehereunto set my hand and seal.

WM. C. STILES. [L. s.]

Witnesses:

CHARLES MARsH, T. L. NICHOLSON.

